Monday features a wide contrast of conditions in the primary U.S. and Canadian Prairie crop regions, with light snow and cold conditions in the northern and eastern Midwest and the eastern Prairies, versus a warm and dry trend in the Southern Plains. The Southern Plains mildness spreads eastward this week before a new sharp cold wave moves into the interior U.S. by the weekend. South America satellite imagery indicates clouds and rain in northern Brazil crop areas, with dry conditions in southern Brazil and Argentina.